Farcical (6)
I believe the answer is:
absurd
'farcical' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for absurd that I've seen before include "'Ridiculous, silly (6)'" , "Highly illogical" , "word to describe Beckett's theatre!" , "'Derisory, cockeyed (6)'" , "Foolish, quite ridiculous" .)